SELEGILINE might help but has side affects. i definately feel it's affect.
i am always fatigued. but not from sinemet.

remember, once you start taking l-dopa, it's likely your natural dopamine production decreases - feedback loop. so when the sinemet wears off, you may feel worse than before you started taking it. so gotta take the right amount at the right time everyday. but the good far outweighs the bad imho.